import java.io.*;
import java.util.Scanner;

public class Demo18 {
    public static void main(String[] args) {
        //1.输入路径,并做校验
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入源文件的路径: ");
        String srcPath=scanner.next();
        File srcFile= new File(srcPath);
        if(!srcFile.isFile()){
            System.out.println("源文件路径有误");
            return;
        }
        System.out.println("请输入目标文件的路径: ");
        String destPath = scanner.next();
        File destFile =new File(destPath);
        if(!destFile.getParentFile().isDirectory()){
            System.out.println("目标文件路径有误");
            return;
        }

        //2.执行复制操作
        try(InputStream inputStream = new FileInputStream(srcFile);
        OutputStream outputStream = new FileOutputStream(destFile)){
            while(true){
                byte[] buffer =new byte[1024];
                int n=inputStream.read(buffer);
                System.out.println("n="+n);
                if(n == -1){
                    break;
                }
                //需要把buffer写入到outputStream中
                outputStream.write(buffer,0,n);
            }
        }catch(IOException e){
            e.printStackTrace();
        }
    }
}
